this is needed for qemu, and since it differs for each arch
it can't be circumvented easily by using a macro in CFLAGS.
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
+#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
+#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
+#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define MAP_FILE 0x00
#define MAP_ANON 0x800
#define MAP_ANONYMOUS MAP_ANON
#define MAP_FILE 0x00
#define MAP_ANON 0x800
#define MAP_ANONYMOUS MAP_ANON
+#define MAP_NORESERVE 0x0400
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
+#define MAP_NORESERVE 0x40
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_32BIT 0x40
+#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1
#define POSIX_MADV_NORMAL 0
#define POSIX_MADV_RANDOM 1